18 PREFACE 



The Hydrograpliy of Pr^ince George s County, by F. H. ]!^ewell, 

 gives a brief account of the water supply of the county, which, as in 

 the case of the other Coastal Plain counties, affords but little power 

 for commercial purposes. The author of this chapter is Director of 

 the U. S. Reclamation Service. 



The Magnetic Declination in Prince George's County, by L. A. 

 Bauer, contains much important information for the local surveyors 

 of the county. Dr. Bauer has been in charge of the magnetic investi- 

 gations since the organization of the Survey and has already pub- 

 lished two important general reports upon this subject. He is the 

 Director of the Department of International Research in Terrestrial 

 Magnetism of the Carnegie Institution. 



The Forests of Prince George's County, by F, W. Besley, is an im- 

 portant contribution and should prove of value in the further de- 

 velopment of the forestry interests of the county. Mr. Besley is 

 State Forester of Maryland. 



The State Geological Survey desires to extend its. thanks to the 

 several national organizations which have liberally aided it in the 

 preparation of several of the papers contained in this volume. The 

 Director of the U. S. Geological Survey, the Chief of the U. S. 

 Weather Bureau, the Chief of the U. S. Forest Service and the 

 Chief of the Bureau of Soils of the U. S. Department of Agriculture 

 have granted many facilities for the conduct of the several investiga- 

 tions and the value of the report has been much enhanced thereby. 



